*{
	margin: 0;
	padding: 0;
}

.plat{
	position: absolute;
	border: 3px solid black;
	height: 185px;
	width: 380px;
	left: 50%;
	top: 50%;
	margin-left: -190px;
	margin-top: -93px;
	
}

.circle1,
.circle2,
.circle3,
.circle4,
.circle5{
	position: absolute;
	width: 100px;
	height: 100px;
	border: 10px solid black;
	border-radius: 50%;
}

.circle1{
	border-color: red;
	left: 0;
	top: 0;
	z-index: 1;
}
.circle2{
	border-color: green;
	left: 130px;
	top: 0;
	z-index: 1;
}

.circle3{
	border-color: yellow;
	left: 260px;
	top: 0;
	z-index: 1;
}

.circle4{
	border-color: blue;
	left: 65px;
	top: 70px;
}
 .circle5{
 	border-color: purple;
 	left: 195px;
 	top: 70px;
 }
